Method for piercing nut-blanks.



C. S. LANMAN & W. N. ESCHLEMAN.

E. ESCHLEMAN, ADMINISTRATRIX 0F w. N- ESCHLEMAN, own.

METHOD FOR PIERCING NUT BLANKS.

APPLICATION FILED JULY 24, 1916.

1,279,716. Patented Sept. 24, 1918.

a I 3 i I I N 4 6 /7 UNITED STATES PATENT OFFICE.-

CHARLES S. LAliTMAN, OF COLUMBUS, OHIO, AND WILLIAM N. ESCHLEMAN, DECEASED, BY ELLEN ESCHLEMAN, ADMINISTRATRIX, 0F COLUMBUS, OHIQ.

Specification of Letters Patent.

METHOD FOR PIERCI NG NUT-BLANKS.

Patented Sept. 24, 1918;

and this application filed July 24,

1916. Serial No. 110,821.

Piercing N ut-Blanks, of which the following is a specification.

This invention relates to an improved method for piercing nut blanks, or, in other words, to a method whereby the central contents of a nut blank maybe removed.

This application is also a division of our application, serial number 692,453, filed April 22, 1912.

The main object of this improved method is to produce a nut blank wherein the centralopening may be uniform in shape and size throughout its length.- To this end, the method of manipulating the various machine parts, as shown in the accompanying sheet of drawings is resortedto. In this sheet of drawings, similar characters of reference designate corresponding parts, and

Figure l diagrammatically represents the crowning and piercing tools in their proper position with respect to the shaping die previqiusly to insertion of the severed blank, an

Figs. 2, 3 and 4 represent the successive stages of the various elements as outlined above during the process of compressing and disloding the central core.

The die is represented by the reference numeral 1 and is suitably shapedto receive a suflicient quantit of metal which may be fed thereto in any desired manner. operating presser elements or crowning tools 2 and 3 are provided, to operate in opposi-' tion to each other in such manner that the severed nut blank material is forced into the die space 4 by the tool 3 and into engagement with the tool 4 in which manner the rear presser elements form an abutting wall. Afterthis operation has been completed, the removing of the central contents of the blank takes place. This is accomplished by means of piercer tools 5 and 6, shown as being slidably mounted within the crowning tools 2 and 3 respectively. It

Two coone side and slightly completely fill up the space 4 in the die 1,

where y the nut blank is properly shaped. However, it is essential that the slug 7 formed between the two piercer ends, should be displaced and in order-to do this properly, we found that the same should be ef-.

fected by bringing the two piercer elements into the nut blank unequal distances and then forcing the slug out by the continued movement of the piercer which has entered the nut blank the greater distance. Thus, in Fig. 2, it will be observed that the two crowning tools are in proper position to form a housing with the aid of the die 1 to hold the nut blank properly located and also that the two piercer elements 5 and 6 have been forced into the nut blank unequal distances as related above, to form the central slug 7. Fig. 3 shows the succeeding operation, in which the two crowning tools have remained stationary, but the two piercer tools have moved toward the right to expel the central slug 7, which causesthe dislodgment of the slug 7 by the continued movement of the the greater distance. The reason it is desirable to dislodge the slug in this manner is that during the commercial operation of the machine, it is practically impossible to keep the two piercer tools in tudinal alinement with each other due more particularly to thewear of the various parts. Assuming that these tools are not in longitudinal alinement with each other, the expulsion of the central slug by the continued movement of the other, will cause the formation of a hole which is round on oblongon the opposite side, this opposite side havlng an opening formed by the .overlappii'ig of two circles.

not concentric. This same condition may, of course, exist by the employment of the method outlined above before the swaging proper longiaction of the follow-uppiercer 5, in such the slug 7 to will be drawn that before the fibers ]O1I11I1g the nut blank are broken, they and distributed over or socket formed by the tool 6 where this shifting is possible and are subsequently entirely severed by the action of the followup tool. Therefore, we have located and caused the tools 5 and 6 to be operated in such manner that the slug lies closer to one face of the nut blank than the other. By this arrangement then the socket formed by the piercer 6 is re-formed due to the swaging of the metal connection the slug 7 has with the nut blank should the tools not be in proper alinement and, therefore, it follows that the hole through the nut blank must be smooth and well formed and the same on both sides of the blank. Fig. 4 shows the operation of dislodging both the slug and blank after the piercer tools have been moved from the position shown in Fig. 3 to the position shown in Fig. 4:, which movement is taken relative to the crowning tools which also have been moved to a position outside the die 1.

From the foregoing description, it will be the surfaceof the hole apparent that we have provided an improved method whereby the central openings formed in the nut blanks will be smooth throughout their entire surface and that this smoothness is caused directly by the swaging action of the follow-up piercer tool in swaging the metal fibers connecting the slug to the blank body as has been outlined, this swaging action being confined only to a small portion of the nut blank so that a perfect hole may be formed before the fibers are completely severed.

lVhat we claim is:

The method of piercing nut blanks which consists in compressing a central slug to a position at one side of the center of said blank and then forcing said slug out of that side of the blank.

In testimony whereof we affix our signatures in presence of two witnesses.

CHARLES S. LANMAN.

ELLEN ESCHLEMAN, Administ'mzfrix of William N. E schlenum.

Witnesses:

WALTER E. S. BOOK, RUssEL M. MCCORMICK. 

